<template>
  <div class='playlist'>
    <div class="cover">
      <div class="cover-img">
        <el-image :src="details.coverImgUrl">
          <div slot="placeholder"
               class="image-slot">
            <i class="iconfont icon-placeholder"></i>
          </div>
        </el-image>
      </div>
      <div class="cover-info">
        <div class="cover-title">
          {{details.name}}
        </div>
        <div class="cover-author"
             v-if="details.creator">
          <el-image :src="details.creator.avatarUrl"
                    class="cover-avatar">
            <div slot="placeholder"
                 class="image-slot">
              <i class="iconfont icon-placeholder"></i>
            </div>
          </el-image>
          <div class="cover-name">{{details.creator.nickname}}</div>
          <div class="cover-date">{{$utils.formartDate(details.createTime, 'yyyy-MM-dd')}}</div>
        </div>
        <div class="cover-tags"
             v-if="details.tags">
          <router-link :to="{ path: '/playlist', query: { cat: tag }}"
                       class="tag"
                       v-for="(tag, index) in details.tags"
                       :key="index">#{{tag}}</router-link>
        </div>
        <div class="cover-digital">
          <span class="cover-playCount"><i class="iconfont icon-playnum"></i> {{$utils.formartNum(details.playCount)}}次</span>
          <span class="cover-collect"><i class="iconfont icon-collect"></i> {{$utils.formartNum(details.subscribedCount)}}</span>
          <span class="cover-comment"><i class="iconfont icon-comment"></i> {{$utils.formartNum(details.commentCount)}}</span>
        </div>
        <div class="cover-desc"
             v-if="details.description">
          <h5>歌单简介<em class="desc-close"
                v-if="isShowDesc"
                @click="isShowDesc = false"><i class="iconfont icon-closed"></i></em></h5>
          <p v-html="details.description"
             @click="showAllDesc"></p>
          <pre class="cover-desc-all"
               v-if="isShowDesc">
                        {{details.description}}
                    </pre>
        </div>
      </div>
    </div>
    <div class="song-header">
      <h4>歌曲列表 <em>{{total + '首歌'}}</em></h4>
      <span class="play-all"
            @click="playAllSongs"><i class="iconfont icon-audio-play"></i> 播放全部</span>
    </div>
    <template v-if="isLoading">
      <Loading />
    </template>
    <template v-else>
      <song-list :songList="songList"
                 :stripe="true"></song-list>
    </template>
  </div>
</template>

<script>
import { mapMutations, mapActions } from 'vuex'
import { formatSongInfo } from '@utils/song'
import songList from '@components/common/song-list'
import Loading from '@components/common/loading'
export default {
  components: {
    songList,
    Loading
  },
  data () {
    // 这里存放数据
    return {
      id: '',
      details: {},
      songList: [],
      total: 0,
      isLoading: true,
      isShowDesc: false
    }
  },
  // 监听属性 类似于data概念
  computed: {},
  mounted () {
    this.id = this.$route.query.id
    // 歌单详情
    this.getDetail({ id: this.id, s: '' })
  },
  // 方法集合
  methods: {
    ...mapMutations({
      setPlayStatus: 'SET_PLAYSTATUS',
      setPlayList: 'SET_PLAYLIST',
      setPlayIndex: 'SET_PLAYINDEX'
    }),
    // 登录及未登录下获取歌单中歌曲的列表
    async getDetail (params) {
      this.isLoading = true
      const { data: res } = await this.$http.playlistdetail(params)

      if (res.code !== 200) {
        return this.$msg.error('数据请求失败')
      }
      this.details = res.playlist

      const ids = res.playlist.trackIds

      this.getAllSongs(ids)
    },
    // 登录后根据ids获取所有歌曲列表
    async getAllSongs (ids) {
      const sliceArr = []
      const num = 500
      let idsArr = []

      // 数组过长 每500份一组
      for (let index = 0; index < ids.length; index += num) {
        sliceArr.push(ids.slice(index, index + num))
      }

      for (let i = 0; i < sliceArr.length; i++) {
        const arrs = []
        sliceArr[i].map(d => {
          arrs.push(d.id)
        })
        const { data: res } = await this.$http.songDetail({ ids: arrs.join(','), timestamp: new Date().valueOf() + i })

        idsArr = idsArr.concat(this._formatSongs(res))
      }

      this.songList = idsArr
      this.total = idsArr.length
      this.isLoading = false
    },
    // 播放列表为当前歌单的全部歌曲
    playAllSongs () {
      this.playAll({
        list: this.songList
      })
    },
    // 歌单简介查看更多
    showAllDesc () {
      if (this.details.description.length > 88) {
        this.isShowDesc = !this.isShowDesc
      }
    },
    // 处理歌曲
    _formatSongs (list) {
      const ret = []
      list.songs.map((item, index) => {
        if (item.id) {
          // 是否有版权播放
          item.license = !list.privileges[index].cp
          ret.push(formatSongInfo(item))
        }
      })
      return ret
    },
    ...mapActions(['playAll'])
  },
  watch: {
    $route () {
      this.id = this.$route.query.id
      // 歌单详情
      this.getDetail({ id: this.id, s: '' })
    }
  }
}
</script>
<style scoped lang="less">
.cover {
  display: flex;
}
.cover-img {
  position: relative;
  width: 200px;
  height: 200px;

  &::after {
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
    content: '';
    transform: scale(0.95) translateX(5%);
    background: #f0f0f0;
  }
}
.cover-info {
  flex: 1;
  padding-left: 40px;

  .cover-title {
    font-size: 24px;
    font-weight: bold;
  }
}
.cover-author {
  padding: 15px 0 10px;

  .cover-avatar {
    display: inline-block;
    width: 32px;
    height: 32px;
    border-radius: 100%;
    vertical-align: top;
  }

  .cover-name,
  .cover-date {
    display: inline-block;
    padding: 0 10px;
    line-height: 32px;
  }

  .cover-date {
    color: #999;
  }
}
.cover-tags {
  padding-bottom: 5px;
  line-height: 16px;

  .tag {
    display: inline-block;
    margin-right: 5px;
    font-size: 12px;
    color: @color-theme;
  }
}
.cover-playCount,
.cover-collect,
.cover-comment {
  display: inline-block;
  padding: 0 20px 5px 0;
  line-height: 16px;
  font-size: 14px;
  color: #999;

  i {
    vertical-align: top;
  }
}
.cover-desc {
  position: relative;

  h5 {
    padding: 10px 0 5px;
    line-height: 20px;
    font-size: 14px;
    color: #333;
  }

  .desc-close {
    position: absolute;
    top: 30px;
    right: 0;
    z-index: 2;
    cursor: pointer;
  }

  p {
    line-height: 22px;
    font-size: 14px;
    color: #999;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-all;
    cursor: pointer;
  }

  .cover-desc-all {
    position: absolute;
    top: 50px;
    left: 10px;
    z-index: 1;
    width: calc(~'100% - 20px');
    padding: 10px;
    margin: -10px;
    max-height: 250px;
    line-height: 22px;
    font-size: 14px;
    white-space: pre-line;
    font-family: inherit;
    color: #999;
    background: #fff;
    overflow-y: scroll;
    box-shadow: 0 2px 10px 0 rgba(52, 52, 52, 0.1);
  }
}
.song-header {
  display: flex;
  padding: 30px 0 10px;

  h4 {
    flex: 1;
    font-size: 20px;
    line-height: 40px;

    em {
      display: inline-block;
      padding-left: 10px;
      font-size: 12px;
      line-height: 14px;
      font-style: normal;
      font-weight: normal;
      color: #666;
      vertical-align: baseline;
    }
  }

  span {
    display: flex;
    line-height: 16px;
    align-items: center;
    justify-content: center;
    border-radius: 50px;
    padding: 7px 20px;
    cursor: pointer;
    margin: 5px 0 5px 15px;
    transition: all 0.4s;
    background: #f0f0f0;
    color: #333;

    i {
      margin-right: 3px;
    }
  }

  .play-all {
    color: #fff;
    background: @color-theme;

    i {
      color: #fff;
    }
  }

  .collect.active,
  .collect.active i {
    color: @color-theme;
  }
}
</style>
